math
posted by jerson on .
A local movie theater found that if the admission was $13, the attendance was about 1900 customers per day. When the price of admission was dropped to $7, attendance increased to about 3000 per day. Write a linear equation for the attendance in terms of price, p. (A=mp+b)
Ok this is what i got
A30001900/713
= 550/3
A1900=550/3(P13)
A1900=550/3P+7150/3
And it says the answer is
550/3p+12850/3
I'm confused with how they got 12850/3 instead of 9050/3 because if you add 1900 and 7150 that's what u get..
thanks in advance

let's take it from
A1900=550/3(P13) , which is correct
I usually try to eliminate my fractions, so I will multiply by 3
3A  5700 = 550(P13)
3A  5700 = 550P + 7150
3A = 550P + 7150 + 5700
3A = 550P + 12850
A = (550/3)P + 12850/3